Coil forms with ends of inslation having electrical terminals thereon



Jan. 26, 1954 B EELS 2,667,624

COIL FORMS WITH ENDS OF INSULATION HAVING ELECTRICAL TERMINALS THEREON Filed May INVENTOR BASIL A. BELS ATTORN E Y5 Patented Jan. 26, 1954 COIL FORMS WITH ENDS F INSULA- TION HAVING ELECTRICAL TERMI- NALS THEREON Basil A. Bels, Great Ne mesne assignments,

America as represente Navy ck, N. Y., assignor, by

the United States of d by the Secretary of the Application May 9, 1951, Serial N 0. 225,359 2 Claims. (01. 339-147) The present invention relates to forms for use in the manufacture of coils or windings, and especially high-frequency coils.

Radio frequency coil forms heretofore have not been entirely satisfactory because their designs are not adapted to mass production manufacturing methods. Such forms usually comprise a cylinder on which windings are wound, a pair of barriers being provided near opposite ends of the cylinder for confining the windings within a given region on the cylinder. In some prior structures these barriers are fiber washers which are pushed or pressed on the cylinder so that they may be positioned by means of a friction or press fit. In many instances it is necessary to cement or coalesce these barriers to the cylinder in order to provide joints which accurately maintain the barriers in fixed positions on the cylinder. Conductor terminals are usually held by these barriers and when a soldering connection is made to these terminals, heat from the soldering iron may impair a coalesced joint between a barrier and the cylinder.

Accordingly it is an important object of the present invention to provide an improved and inexpensive coil form that is adapted to mass production methods.

An equally important object is to provide such a form that will maintain positive joints between its barriers and cylinders under all conditions.

important objects and advantages of the invention will more readily appear from the detailed specification and the accompanying drawing of a preferred form of the invention. In the drawing:

Fig. 1 is a perspective view of a coil-form embodying the present before being bent Fig. 2 is an exploded view of a detail of the assembly;

Fig. 3 is a sectional view taken substantially on the line 33 of Fig. 1; and

Fig. 4 is a sectional view taken substantially on the line 4-4 of Fig. 1 before the bending over of the staple thereat.

As shown in Figs. 1 and 2 a form indicated in its entirety by the numeral I0 comprises a tube ll preferably formed of an inexpensive plastic material and containing a, pair of diametrically opposed square holes I2 near each of its open ends. A pair of similar barrier washers l3 which may also be formed of an inexpensive resilient plastic material is provided at each end of the form It). As better shown in Figs. 2 and 3, each washer is a split circle with a rather wide opening or throat portion I 4 and an inwardly extending squared lug portion I5 diametrically opposite to the throat portion. Each washer also has a pair of holes IS on each side thereof, located between its throat portion I 4 and lug portion l5. Another pair of holes I1 is provided in each washer radially in line with its lug portion l5.

M of each washer is of a width slightly less than the diameter of the tube ll so that the washer can be snapped over the tube H with its lug l5 fitting into a hole [2 in the tube ll.

At each end of the tube H, the washers are put or snapped on the tube from opposite sides, with one washer covering the open throat portion I 4 of the underlying Washer, forming, in eifect, a completely circular washer or ring at each end of the tube II. The inner contours of the washers snugly fit the tube II. The lugs [5 of each pair of associated washers l3 accurately position the washers with their holes l6 aligned or registered to receive suitable securing means in the form of staples or terminal wires 20, preferably of tinned copper wire, readily bent into any desired shape or position. As shown in Fig. 4, each staple 20 comprises a loop 2| and a pair of legs 22 originally straight so that they can easily be passed through registered holes IS. The legs can then be bent over to the positions shown at the top of Fig. 1, and the loop turned from the dotted position shown in Fig. 1 to the horizontal position, so that the staple also helps to keep a pair of washers at each end of the tube ll together. The loop extends outwardly to provide an external terminal for the end of a winding wound upon the core. The staples can be removed, if necessary, by bending their legs straight so that they can be pulled out of the associated holes l6. Additional terminals may be supplied, if desired, by adding staples 23 which fit into holes ll of the washers.

The washers may be fairly stiff but preferably have some resilience; and the holes l2 are of a size snugly to receive a lug IS. The holes l2 at tube II are displaced axially a to press against each other. The staples are then added.

It is apparent that the coil form of the present invention is readily adapted to mass production fabrication and assembly; and since it has no cemented or similar joints between its endbarriers and cylindrical body, conductors can readily be soldered to its staples without fear of damage to the coil form.

Only a preferred embodiment of the present invention has been disclosed, but, various modifications thereof are contemplated and may be obviously resorted to by those skilled in the art Without departing from the spirit and scope of the invention as defined hereinafter by the appended claims, wherein it is claimed:

1. A coil mounting comprising a cylindricaltubular member having a pair of diametrically opposed apertures near one end thereof, a pair of annular open throated washers, the throat opening in each washer having radial edges positioned so that the inner arc of said throat opening is smaller than the diameter of said cylindrical tubular member, said washers being positioned upon the member adjacent said apertures with a solid portion of a first of said washers covering the open throat of a second of said washers, an integral lug portion on each of said washers positioned opposite the throat portion and operative to enter said apertures to lock said washers upon the member against slidable and rotational movement, said washers having a pair of aligned holes therein, and a removable staple passing through the pair of holes to secure the washers firmly together and to provide a terminal means for a coil wound upon the mount- 2. A radio frequency coil form comprising a cylindrical tubular member having diametrically opposed apertures near one end thereof, a pair of annular open throated washers, the throat opening in each washer having radial edges spaced from one another to form a throat opening whose inner arc is smaller than the diameter of said cylindrical tubular member, each of said washers having an integral lug portion opposite the throat portion, said washers being snapped over said end in opposed relation adjacent said apertures with the lug portions engaging said apertures, whereby said Washers are secured against axial and rotational movement upon said form, said washers also having a plurality of pairs of aligned holes therein, and a removable wire staple passing through each of said pairs of holes to securely fasten the washers together and to provide an external terminal means for a coil wound upon the coil form.

BASIL A. BELS.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,236,357 Reeve Aug. 7, 1917 1,491,321 Swoboda Apr. 22, 1924 1,659,062 Varley Feb. 14, 1928 2,128,434 Seeley Aug. 30, 1938 2,517,848 Del Camp Aug. 8, 1950 

